src/mesa/drivers/dri/i965/brw_gs.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "main/glheader.h"
  33 #include "main/macros.h"
  34 #include "main/enums.h"
  35
  36 #include "intel_batchbuffer.h"
  37
  38 #include "brw_defines.h"
  39 #include "brw_context.h"
  40 #include "brw_eu.h"
  41 #include "brw_util.h"
  42 #include "brw_state.h"
  43 #include "brw_gs.h"
  44
  45
  46
  47 static void compile_gs_prog( struct brw_context *brw,
  48                              struct brw_gs_prog_key *key )
  49 {
  50    struct intel_context *intel = &brw->intel;
  51    struct brw_gs_compile c;
  52    const GLuint *program;
  53    GLuint program_size;
  54
  55    memset(&c, 0, sizeof(c));
  56
  57    c.key = *key;
  58    /* Need to locate the two positions present in vertex + header.
  59     * These are currently hardcoded:
  60     */
  61    c.nr_attrs = brw_count_bits(c.key.attrs);
  62
  63    if (intel->gen == 5)
  64        c.nr_regs = (c.nr_attrs + 1) / 2 + 3;  /* are vertices packed, or reg-aligned? */
  65    else
  66        c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  67
  68    c.nr_bytes = c.nr_regs * REG_SIZE;
  69
  70
  71    /* Begin the compilation:
  72     */
  73    brw_init_compile(brw, &c.func);
  74
  75    c.func.single_program_flow = 1;
  76
  77    /* For some reason the thread is spawned with only 4 channels
  78     * unmasked.
  79     */
  80    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  81
  82
  83    /* Note that primitives which don't require a GS program have
  84     * already been weeded out by this stage:
  85     */
  86    switch (key->primitive) {
  87    case GL_QUADS:
  88       brw_gs_quads( &c, key );
  89       break;
  90    case GL_QUAD_STRIP:
  91       brw_gs_quad_strip( &c, key );
  92       break;
  93    case GL_LINE_LOOP:
  94       brw_gs_lines( &c );
  95       break;
  96    case GL_LINES:
  97       if (key->hint_gs_always)
  98          brw_gs_lines( &c );
  99       else {
 100          return;
 101       }
 102       break;
 103    case GL_TRIANGLES:
 104       if (key->hint_gs_always)
 105          brw_gs_tris( &c );
 106       else {
 107          return;
 108       }
 109       break;
 110    case GL_POINTS:
 111       if (key->hint_gs_always)
 112          brw_gs_points( &c );
 113       else {
 114          return;
 115       }
 116       break;
 117    default:
 118       return;
 119    }
 120
 121    /* get the program
 122     */
 123    program = brw_get_program(&c.func, &program_size);
 124
 125     if (INTEL_DEBUG & DEBUG_GS) {
 126        int i;
 127
 128       printf("gs:\n");
 129       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 130          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 131                     intel->gen);
 132       printf("\n");
 133     }
 134
 135    /* Upload
 136     */
 137    dri_bo_unreference(brw->gs.prog_bo);
 138    brw->gs.prog_bo = brw_upload_cache_with_auxdata(&brw->cache, BRW_GS_PROG,
 139                                                    &c.key, sizeof(c.key),
 140                                                    NULL, 0,
 141                                                    program, program_size,
 142                                                    &c.prog_data,
 143                                                    sizeof(c.prog_data),
 144                                                    &brw->gs.prog_data);
 145 }
 146
 147 static const GLenum gs_prim[GL_POLYGON+1] = {
 148    GL_POINTS,
 149    GL_LINES,
 150    GL_LINE_LOOP,
 151    GL_LINES,
 152    GL_TRIANGLES,
 153    GL_TRIANGLES,
 154    GL_TRIANGLES,
 155    GL_QUADS,
 156    GL_QUAD_STRIP,
 157    GL_TRIANGLES
 158 };
 159
 160 static void populate_key( struct brw_context *brw,
 161                           struct brw_gs_prog_key *key )
 162 {
 163    GLcontext *ctx = &brw->intel.ctx;
 164    memset(key, 0, sizeof(*key));
 165
 166    /* CACHE_NEW_VS_PROG */
 167    key->attrs = brw->vs.prog_data->outputs_written;
 168
 169    /* BRW_NEW_PRIMITIVE */
 170    key->primitive = gs_prim[brw->primitive];
 171
 172    key->hint_gs_always = 0;     /* debug code? */
 173
 174    /* _NEW_LIGHT */
 175    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 176    if (key->primitive == GL_QUADS && ctx->Light.ShadeModel != GL_FLAT) {
 177       /* Provide consistent primitive order with brw_set_prim's
 178        * optimization of single quads to trifans.
 179        */
 180       key->pv_first = GL_TRUE;
 181    }
 182
 183    key->need_gs_prog = (key->hint_gs_always ||
 184                         brw->primitive == GL_QUADS ||
 185                         brw->primitive == GL_QUAD_STRIP ||
 186                         brw->primitive == GL_LINE_LOOP);
 187 }
 188
 189 /* Calculate interpolants for triangle and line rasterization.
 190  */
 191 static void prepare_gs_prog(struct brw_context *brw)
 192 {
 193    struct brw_gs_prog_key key;
 194    /* Populate the key:
 195     */
 196    populate_key(brw, &key);
 197
 198    if (brw->gs.prog_active != key.need_gs_prog) {
 199       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 200       brw->gs.prog_active = key.need_gs_prog;
 201    }
 202
 203    if (brw->gs.prog_active) {
 204       dri_bo_unreference(brw->gs.prog_bo);
 205       brw->gs.prog_bo = brw_search_cache(&brw->cache, BRW_GS_PROG,
 206                                          &key, sizeof(key),
 207                                          NULL, 0,
 208                                          &brw->gs.prog_data);
 209       if (brw->gs.prog_bo == NULL)
 210          compile_gs_prog( brw, &key );
 211    }
 212 }
 213
 214
 215 const struct brw_tracked_state brw_gs_prog = {
 216    .dirty = {
 217       .mesa  = _NEW_LIGHT,
 218       .brw   = BRW_NEW_PRIMITIVE,
 219       .cache = CACHE_NEW_VS_PROG
 220    },
 221    .prepare = prepare_gs_prog
 222 };